CYCLING IN THE ECOSYSTEM

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CYCLING IN THE ECOSYSTEM 18.4 pp. 371-374

DEFINITIONS Ecosystem: an environment where the living (biotic) and non-living (abiotic) things affect one another Biogeochemical process: circulation of substances through living organisms and the environment

WATER CYCLE

WATER CYCLE Evaporation: water vapor enters the atmosphere

WATER CYCLE Evaporation: water vapor enters the atmosphere Transpiration: evaporation of water through the leaves of plants

WATER CYCLE Precipitation: water vapor that leaves the atmosphere

CARBON CYCLE

CARBON CYCLE Photosynthesis: converting light energy into organic compounds (C6H12O6) CO2 + H2O  C6H12O6

CARBON CYCLE Cellular respiration: breaks down sugar to release energy and CO2 is released into atmosphere (C6H12O6  CO2 + H2O + ATP)

CARBON CYCLE Combustion: burning of fossil fuels for energy releases CO2

NITROGEN CYCLE 70% of atmosphere is nitrogen, but it is not in a ready to use form N2 needs to converted into NH3 (ammonia)

NITROGEN CYCLE nitrogen fixation: bacteria convert nitrogen gas (N2) to usable form, NH3 (ammonia)

NITROGEN CYCLE nitrogen fixation: bacteria convert nitrogen gas (N2) to usable form, NH3 (ammonia) ammonification: decomposers break down wastes (urine, feces, death) to NH3

NITROGEN CYCLE nitrification: bacteria convert NH3 to nitrates (NO3-) i.e. like fertilizers assimilation: plants absorb nitrate to make amino acids (enters food chain)

NITROGEN CYCLE Denitrification: bacteria return nitrogen to atmosphere (NO3-  N2)

Complete Cycles trifold Use textbook and handout to draw cycles in the appropriate area. Cycles should be neat, simple, labeled, and colored